, Volume 54, Issue 4, pp 790-797
Date: 18 Apr 2012

Resistance to dynamic deformation and fracture of tantalum with different grain and defect structures

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Abstract

This paper presents the results of measurements of the strength properties of technically pure tantalum under shock wave loading. It has been found that a decrease in the grain size under severe plastic deformation leads to an increase in the hardness of the material by approximately 25%, but the experimentally measured values of the dynamic yield stress for the fine-grained material prove to be less than those of the initial coarse-grained specimens. This effect has been explained by a higher rate of stress relaxation in the fine-grained material. The hardening of tantalum under shock wave loading at a pressure in the range 40–100 GPa leads to a further increase in the rate of stress relaxation, a decrease in the dynamic yield stress, and the disappearance of the difference between its values for the coarse-grained and fine-grained materials. The spall strength of tantalum increases by approximately 5% with a decrease in the grain size and remains unchanged after the shock wave loading. The maximum fracture stresses are observed in tantalum single crystals.

Original Russian Text © S.V. Razorenov, G.I. Kanel’, G.V. Garkushin, O.N. Ignatova, 2012, published in Fizika Tverdogo Tela, 2012, Vol. 54, No. 4, pp. 742–749.